I noticed a clump of similars trawling for bargains, and did some digging, and I'm about at the limit of my search-fu. If anyone has ideas for more targeted searching, there might be other interesting finds outside cookbooks.

Basically, many of the Simon & Schuster imprints I've advanced-searched on at Amazon US have a number of 99-cent titles. Definitely in cookbooks, probably in other how-to-esque nonfiction, a smattering in other areas.

Beans on Toast: How a simple meal is the result of tens of thousands of years of human development. by Simon Myers

Simple things often have complex histories.
This book looks into how the different food elements that make up a seemingly simple meal of Beans on Toast came into being.
It explores how the constituent parts of this meal are the product of many thousands of years of human development and illustrates how a plate of beans on toast is a fascinating and illustrative example of the history of human ingenuity.

This is part of the Simon and Schuster free book sale. I'm not sure how to get a nice list at Amazon, but this is one of 104 free food and drink ebooks from the Simon and Schuster imprint Adams Media. 12 more from Simon and Schuster's main imprint.